[Gvsig_english] clip postGIS polyline layer

[J. S. D.]

I'm a new user of gvSIG 1.1.1, and I thank the developers for the 
excellent work they are doing.  I have been trying to run it in two 
situations: Windows (Vista), and Linux (Ubuntu 7.10).

I am aware that Vista is not presently supported, but I find that gvSIG 
works just fine for vector data in Vista, including Sextante.  As noted 
in a previous thread, however, gvSIG crashes in Vista when adding an 
image file layer is attempted.  So that means I turn to Linux.

In Ubuntu 7.10, most of the functions of gvSIG 1.1.1 seem to work as 
they should.  Both vector and raster layers can be added and 
manipulated. I am using postGIS and am able to add layers successfully, 
including using gvSIG to create and edit new layers which are stored in 
postGIS. 

However, one situation where I cannot get gvSIG to behave as I expect is 
when I attempt to use a polygon layer to clip a polyline layer which is 
stored in postGIS.  When I try this, I get a message saying "Result 
layer is empty. Check for a possible error."  Both polyline and polygon 
layers were created and edited as new postGIS layers in gvSIG in the 
same view, so I don't believe this problem is due to an error in the 
data format. (The clip works properly if the layers are exported to 
shapefile.)

Is this a reproducible bug? If not, any suggestions for the cause?

Thanks,
Joe